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No. 6|6,735. Patented Dec. 27, |898.

G. H.A SACHSENRDER. y

DRAWING BLLEB.

` (Application tiled July 24, 1897.) (N0 Model.) 2 shuts-Sheet l.

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no. 616,735. Patented nec. 27, |893. G. H. SACHSENRDER. DRAWING noLLEn. m'npmaeion med .my 24, 1897.) (No. Model.) 2 Shasta-Sheet 2.

UNITEDA STATES PATENT OFFICE.

eUsTAv HEINRICH sACHsENRDER, 0F RARMEN, GERMANY.

DRAWING-ROLLER.

SPECIFICATION forming part of Letters Patent No. 616,735, dated December 27, 1898.

Application Eled July 24, 1897. Serial No. 645,805. (No model.)

To all whom it may concern.-

Beit known that I, GUsTAv HEINRICH SACH- SENRDER, a subject of the King of Prussia, Germ an Emperor, residing at Barmen-Unterbarmen, in the Province of Rhenish Prussia, Kingdom of Prussia, Germany, have invented new and useful Improvements in Drawing- Rollers of Spinning-Machines, of which the following is a specification.

In cotton-spinning the drawing-rollers are supplied with coverings or casings of leather for the purpose of effecting stretching of the yarn. With such coverings particular attention must be paid that the thickness is everywhere the same, since any inequality in the roller produces corresponding inequality in the spun yarn. The leather of the covers has therefore to be very carefully and uniformly prepared, the cost being thus very considerable. It is, further, of great importance that the place of junction of the leather band forming the cover be perfectly smooth. For this purpose the ends of the band are cut as much as possible in an oblique direction and then cemented one over the other in such manner that the layer of the now completed rollercovering has at the place of junction precisely the same thickness as at'the other parts and that the external edge of the band does not project or form a seam, as such irregularity would also exert a detrimental influence on the yarn to be spun. The expensiveness of the manufacture, as well as the high price of leather, has led to all manner of experiments with presumable substitutes for the latter, with the object of producing coverings which while being cheaper would answer the requirements equally well. So far, however, these endeavors have not proved practically' successful. Experiments have also already been made with paper parchment, but have likewise been without success, owing to the inability to produce the parchment in sufficient thickness and of suitable consistency to obtain an even juncture of thecover ends, and as an ordinary cementing material has been used, with which, as is Well known, paper parchment can only be temporarily but never permanently united, really durable parchment coverings have never been produced at all. The present invention has overcome all these difiiculties by softening a thin paper parchment with a cellulose dissolving Inedium, (parchment solution,) pasting one layer upon another until the necessary thickness is obtained, and rolling the material simultaneously into tubular or cylindrical form. As adhesive medium a solvent for cellulose (parchment solution) will serve, whereby the individual sheets or layers are united as it were in a single homogeneous parchment mass. In this manner a covering of uniform thickness is obtained, such covering being free from any overlap or ridge. Such coverings if impregnated with glycerin or like aeting substances or moistened with water can then be stretched and pulled over the drawing-rollers and sit closely on the same like ordinary leather coverings. Apart from the much lower price and equal durability they possess the further advantage that they occasion less waste of yarn than do the leather covers.

As known, paper parchment is obtained by subjecting unglued paper to the action of cellulose dissolving medium-namely, slightlydiluted sulfuric acid. It has been observed that by the action of such acid the surface of the paper is converted into adhesive dextrin. In the manufacture of these covers either such sheets of paper with the surface thus made adhesive or sheets of paper parchment whose surfaces have been made adhesive by immersion in such diluted sulfuric acid are caused to adhere together or superposed and formed into rolls or tubes. As cellulose dissolving Iluids, which are serviceable in carrying out this invention, may be mentioned sulfuric acid of to 66 Baume, or chloridofzinc solution, or an ammoniacal solution of copper oxid.

This invention is illustrated in the annexed drawings, in which- Figure l shows an end elevation of a number of layers pasted one on top of the other. Fig. 2 is a plan View of a core over which the layers are bent. Fig. 3 shows the manner of uniting the layers to form a tube or hose. Fig. et shows a piece of tubecompleted. Fig. 5 shows a roller covered by shells or tubes.

At a is shown a number of strips of parchment-paper whose width and combined thickness correspond to the circumference and thickness of the tube to be formed. These IOO strips, suitably softened, are pasted onto one another in such manner that each succeeding strip is laterally transposed, say a few millimeters with respect to the preceding one, the side edges at both sides lying in step form, Figs'. l and 2. These layers are bent longitudinally, the edges of the several strips at the opposite step-shaped or inclined portions being made to butt together and united. The bending can be practically effected about a core b of suitable diameter, Figs. 2 and 3, in suitable way, as by means of guide or cornpression roller or the like,.the pasting or adhering of the edges being eiected by suitablyprovided pressure rollers. The step -like edges cover or lap over one another, as seen in Fig. 4, Without any increase of thickness being caused at the lap, so that a seamless tube is formed with uniform thickness of wall. Endless strips being fed, as described, with proper rapidity, a continuous tube is produced which can be cut or trimmed to any desired length.

That I claim as new, and desire to secure by Letters Patent, is-

A covering which consists of a number of strips of parchment-paper, each strip corresponding in width to the circumference of .that portion or layer of the covering or tube formed by such strip, such strips having been softened by cellulose dissolving medium and having been superposed to a thickness corresponding to the desired thickness of the tube, each succeeding strip being laterally transposed with relation to the adjacent strip so as to cause the side edges of the strips to lie in step-shaped position, and said strips having been pressed together to cause the fibers to cohere or form a homogeneous mass and bent to tube form so as to cause the side edges to butt or join Without overlapping to leave the thickness of the tube -wall uniform or Without a ridge, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

GUSTAV HEINRICH SACHSENRUDER. Witnesses:

O'rTo KNIG, N. T. lTEss. 

